Disparate AQI in adjacent towns

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Right now my air quality app shows my neighborhood as having good air with an AQI of 14, but an area just a few miles away has an AQI of 129. How is this even possible? Surely even with wind there would be residual pollutants? Both places are outside of a big city, roughly 15-20 miles away from the city center.

ETA: the pollution is mainly due to PM2.5 and PM10. I live near Seoul.

In: Other

129 would imply a fire of some sort. Likely driven by NO2 which is a secondary combustion product.

If it were ozone or pm2.5 (the other components in aqi) then it would be more regional.